Oil-display pump



Oct. 1, 19290 A. E. DAVENPORT OIL DISPLAY PUMP Filed Sept. 20 1928 Mag gmwnto'o FL 5. D 'QVILNPEIR'T,

run/ 1 Patented Get. 1 1929 E. DAVENPORT, OF HAYWOOD, ILLINOIS OIL-DISPLAY PUMP The invention relates to oil measuring and dispensing apparatus of the type which includes a sight tube or chamber for indicating flow and for displaying the qualityor a character of the oil.

\Vhile the display provisions heretofore provided are more or less ingenious, they are objectionable for a number of reasons. These may be summarized as inaccessibility or difficult accessibility due to faulty location so thatin case of breakage the pump is idle for a considerable time and replacements are more or less expensive; failure to accomplish the ultimate object, that is to say to attract and hold the attention of the customer; and

the necessity of employing special relief devices to prevent the accumulation of air in the sight chamber.

My invention has for its general objects to overcome the disadvantages of the old practice; to provide a simple and inexpensive sight chamber attachment which readily may be applied or removed and whichconveniently substitutes for the usual elbow joint that connects the upstanding delivery arm of the pump with the gooseneck or nozzle carrying extension thereof; to provide a sight chamber containing buoyant or mobile ob-' jects normally at rest in the bottom of the so chamber and which under flow of oil rise to the top of the chamber and when the flow ceases descend to their normal position; and to provide a sight chamber attachment which requires no pet cocks or other manually operated air relief devices, any air present in the sight chamber or in the oil being automatically discharged through the delivery arm under pump impulse.

The invention is illustrated in the accompanying drawings wherein Figure 1 is a sectional elevational view of the improved attachment applied to the convcntional delivery arm of a pump.

Fig. 2 is a top view of the combination bottom head and L unit.

Referring to the drawings, 5 represents the upstanding delivery arm of the conventional measuring and dispensing pump 6, and 7 represents its nozzle carrying horizontal exa tension. Elements 5 and 7 usually are joined Application filed September 20, 1928. Serial No. 307,318.

by an L. According to my invention I replace the latter with a device for diverting fiow through a sight chamber so that the customer can be reasonably assured of quantity and quality of oil, it being a fact that pumps have sometimes failed to deliver oil notwithstanding evidence of the meter to the contrary.

The replacement is a casting 8 having fluid Ways 9 and 10 which, respectively, accommodate the arms or pipes 5 and 7. The disc shape top of the casting has a marginal rim or flange 11, and an axial fiuidway 12. The annular pocket or well formed by the rim 11 and the neck 13 offluidwa-y 12 has one or more ports 14 to pass oil delivered to the casting by the pump.

The top of the casting forms the basal support and lower head of an oil display chamber consisting of a glass cylinder-15 whose bottom edge is centered and protected by the marginal rim 11, and is secured against leakage by appropriate packing 16. A pipe 17, detachably mounted in the neck 13 of the axial fluidway 12, forms in conjunction with an upper head a tie for the cylinder. The upper head or dome 18 is equipped with packing and with a marginal rim or skirt 19 to protect the top edge of the cylinder. Upper head 18 has an axial an opening 20 whereby it is slidable on the central tubular support 17 in order properly to engage the upper rim of the cylinder 15. The protruding end,,of-pipe 17 is threaded for the reception of an acorn or blind nut 21,

a lead or other gasket 22 being interposed between the nut and the top of the dome to insure rigid and proper sealing relation of the parts.

Pipe 17 is screwed .into the neck 13 of the 99 axial fluidway 12 leading to the delivery arm and is equipped adjacent the dome of the cylinder with one or more lateral openings 23. The merit and advantage of this construction and arrangement is that as the oil rises in the cylinder it forces the air through the openings 23 and into the regular discharge channel. The openings 23, being at the extreme top of the cylinder, any air bubbles which may manifest themselves must necessarily be carried away before the oil can enter the central delivery tube 17. There is always more or less air present in any oil and visible delivery devices have heretofore been equipped with pet cocks or other manually operated devices to get rid of the air in 7 order to )revent compression on the pump stroke an expansion on the delivery. F ailure to open the pet-cock at regular periods to relieve the trapped air accounts in the main for the non-success of the visible device.

l Ve come now to that part of the invention which provides for positive indication of flow and for attracting and holding the attention of the customer. As remarkedat the outset, this is accomplished by locating within the chamber objects ordevices, which are calculated by shape or color and position to arouse attention.v Probably the simplest expedient of this nature is element 24. Elements 24 are hollow ballyshape objects con structed of very thin celluloid, the walls being approximately .006 of aninch in thick- 'ness. They are formed or provided with small holes 25 for the passage of oil. Normally they are at rest in the bottom of the cylinder but-when oil is flowing they rise continuously with the oil until the end of the delivery atwhich time they practically are at the top of the glass. They then descend slowly "to normal position.

Having described my invention, I claim: The combination with the delivery end of oil dispensing apparatus, of a sight chamber included therein, and free objects of greater specific gravity than the oil and normally at rest in the bottom of the chamber in the absence of flowand which in response to flow are mobile-in 'the visible oil to attract and hold attention thereto.

In testimony whereof I aflix my signature.

ARTHUR E. DAVENPORT. 

